Online RSA Encryption, Decryption And Key Generator Tool(Free)

RSA(Rivest-Shamir-Adleman) is an Asymmetric encryption technique that uses two different keys as public and private keys to perform the encryption and decryption. With RSA, you can encrypt sensitive information with a public key and a matching private key is used to decrypt the encrypted message. Asymmetric encryption is mostly used when there are 2 different endpoints are involved such as VPN client and server, SSH, etc.

Below is an online tool to perform RSA encryption and decryption as a RSA calculator.

By default, the private key is generated in PKCS#8 format and the public key is generated in X.509 format.

Generate RSA Key Online

Select RSA Key Size

Public Key

Private Key

RSA Encryption and Decryption Online

Below is the tool for encryption and decryption. Either you can use the public/private keys generated above or supply your own public/private keys.

Any private or public key value that you enter or we generate is not stored on this site,
this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen.

This tool provides flexibility for RSA encrypt with public key as well as private key along with RSA decrypt with public or private key.

RSA Encryption

Enter Plain Text to Encrypt

Enter Public/Private key

RSA Key Type:
Public key
Private Key

Select Cipher Type

Encrypted Output (Base64):

RSA Decryption

Enter Encrypted Text to Decrypt (Base64)

Enter Public/Private key

RSA Key Type:
Public key
Private Key

Select Cipher Type

Decrypted Output:

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Usage Guide - RSA Encryption and Decryption Online

In the first section of this tool, you can generate public or private keys. To do so, select the RSA key size among 515, 1024, 2048 and 4096 bit click on the button.
This will generate the keys for you.

For encryption and decryption, enter the plain text and supply the key. As the encryption can be done using both the keys, you need to tell the tool about the key type that you
have supplied with the help of radio button. By default, public key is selected. Then, you can use the cipher type to be used for the encryption. The different cipger options are
RSA, RSA/ECB/PKCS1Padding and
RSA/ECB/OAEPWithSHA-1AndMGF1Padding. Now, once you click the encrypt button the encrypted result will be shown in the textarea just below the
button.

Remember, the encrypted result is by default base64 encoded.

Similarly, for decryption the process is same. Here, you need to enter the RSA encrypted text and the result will be a plain-text. You have both options to decrypt the encryption with
public and private keys.